Kolasib District is situated on the northern part of Mizoram.

This District is situated between 23^o 70^o S and 24^o 50^o N Latitude and 920^o 50^o W – 93^o E Longitude

It is bounded by Cachar District and Hailakandi District , Assam on the north and north west respectively. On the south and east by Aiawl District, Mizoram and on the south west by Mamit District, Mizoram.

The location of the district occupies an important site as it is the main stream of road communication from other state of Mizoram. National Highway No. 54 passes through the middle of the district from north to south direction. The only Rail head in the state located at Bairabi. The only centre for Military Counter Insurgency & Jungle Warfare School in the country is located at Vairengte, which is the largest and well known to the whole of Asia as well as in the world.